1, maintain balance; such as the elderly, non-central disorders of lower limb weakness, lower limb spasticity and poor foreshortening, the center of gravity shift can not balance and other obstacles, but the role of balance disorders in elderly patients with stroke and multiple cerebral infarction is not large. 2.Support weight; after hemiplegia and paraplegia, patients with reduced muscle strength or weakness of both lower limbs cannot support weight or cannot bear weight due to joint pain, walker can play an alternative role. 3, enhance muscle strength often use cane, axillary cane, because to support the body, therefore, on the upper limb extensor muscle has the effect of enhancing muscle strength. Generally speaking, canes are suitable for hemiplegic patients or those with unilateral lower limb paralysis, and forearm canes and axillary canes are suitable for paraplegic patients. The walking device has a large support area, is more stable than the axillary cane, and is mostly used indoors.